I'm a big fan of many types and style of animation but it's often the quite clean, graphic looking ones that grab my immediate attention. Do Donut is a prime example of this in both look and motion, with clean lines and snappy movement.
The fact that it's funny and well timed is important but if it didn't look good I would likely have never even noticed it in my feed.

It's short, fun and beautifully made so give it a watch and if there are any short animations you think we should share let us know in the comments